Microphone.



L. ERICSONu MICROPHONE. APPLICATION FILED AUG. 15, 1912.

LWQQ Patented Jan. 3, 1914.

Umani) STATES PATE-Nrn. OFFICE.

LAWRENCE ERICSOI\T,OF CHICAGO, ILLINOIS, ASSIGNOR T KELLOGG SWITHBOARD AND SUPPLY COMPANY, OF V((i-IICl-XGO, ILLINOIS, A CORPORATION OF :[I'aIiIil'OlS.I

MICROPHONE.

Specification of Letters Patent.

Patented Jan. 13, 1914.

Application filed August 15, 1912. Serial No. 715,208.

To all 07mm it may concern.'

Be it known that I', LAWRENCE ERIosoN, a citizen of the IUnited States of America, residing in Chicago, county of- Cook. and State of Illinois, have invented certain new and useful Iniprovenrentsin Microphones,

' slidin 1 5 of which'the following is a specification.

My invention relates to microphones in general and has to do morev particularly with that type in. which a handle portion is provided having at its opposite ends a transmitter and `receiver,respectively.

In devices of the character referred to, switch-hooks have been provided, exten ing from one end of the handle whereby the device may be suspended, but

the construction has been such that when the microphone was suspended by its switch hook its handle port-ion assumes an angular position and thereby throwing it outof vertical alinement. This of course caused undue friction in the sliding` switchhook and furthermore did not make a favorable appearance, and one of thefea'- tures of my invent-ion is to provide a de- .,vice of. the character described, having a pivoted suspending switch-hook, which is so arranged that when the device is suspended by its switch-hook, its parts will all -be substantially in vertical orA horizontal Also 1n previous `devices conf alinement. tact springs have been provided withi n the handle portio1i,b'ut were soarranged that they were not accessible for adjustment without practically disassembling a great (leal of the device.

Another fentupe of my invention.is to vprovide a handle portion adapted to be readily removed without disturbing other parts o-f the device whereby the'lsprings are accessible. i

For a more complete .understanding of my invention reference is to be had to thd accompanying drawing in which like ref-- `erence characters indicate like parts and in which Figure 1 is ja side elevation of the pre ferred embodiment of vmy invention hung upon a supporting hook and vwith a por-y tion of the handle member broken away'to disclose t-he switch-hook springs; Fig. V2 is v a view similar 'to Fig. 1 but with the device off its supportinghook and with the handle or central portion shown incros's-section to disclose the interior partsgvFig, 31s a; crosssection along .line 3, 3, of 1 `1g..l.looking in the direction of the arrow indicated thereon; Fig. 4 illustrates in perspective the supporting tube or shell for connecting the receiver and transmitter; Fig. 5 shows in perspectie a' plug adapted to be inserted iu the` upperlend of the "connecting tube for supporting the"switch-hook;. Fig. 6 is a diagrammatic`r circuit varrangement for connecting the device for use `as 'an'ordinary common battery telephone.

Referring now more in detaiL'iny invention as illustrated comprises a central or connect-ing member 1 cut away at "11 and having a lolwer plug 2 inserted therein, and towhich is att-ached a transmitten A by means of screws 3 which pass" through tube 1 andthread into said' plug 2. T he plug 2 is constructed in the nature of a tube 'to allow a cord Zl, which may be connected to the parts of the device, to pass out pf the device. The transmitter A may befy'of any desirable type. An insulatingeinber 6 is suitably lattached to the tube 1 and carries several terminal members 7 and a cord hook 8. Thus .a cord conductor as 4 may be Asupported by the hook S- and its conductors connected to the terminals 7, 8, and other conductors may be extended to vthe switclr 4hook springs i. i A plug 9 is inserted in the upper end ofy tubo 1 and a receiver C is attached at the upper end of the device preferably by means of screws 10 extending through tube, I and threaded into plug 9.v A slot 9i loosely supports switch-hook 11 which is pivotally attached to plug 9 by means of a 'pivot pin 1 2. At the lower end of hook 11 an `insulating butler 13 is secured andengages a contact spring 14: adapted to cooperate with contact springs 15, 16, Said contacts being normally out of engagement, that is when the microphone is suspended from a hoolrmember 17 as shown in Fig. 1.

At the exterior or upper end'fof switch.' hook 11, a hook or ring portionr 111 is provided being so proportioned and related to the pivoted part of the' stem portion 112,that whensuspended from a hook I17 the handle portion will hang substantially perpen* dicular as shown in Fig.'v 1. That is a longitudinal line drawn through the center of the handle portion D will assume subst-antially a perpendicular position. Also, due

to the' construction of the? switch-hook. yand,

' supporting hook 17, the switch-hook 11" due to the relative position ofthe pivot 12 and ring portion 111 when the device is suspended troni the hook 17, the weight of yhook 11 has moved sufficiently to interrupt contacts 14,15, 1(3,1the handle portion D is hangings,r substantially perpendicular in a manner as previously referred to.'

When the device is removed from the moves overinto its alternate positiondue to the action of springli4 whereby the contact springs B are moved into engagea-ent as shown in Fig. 2. Although a certain combination of contact springs is illustrated, my invention is not limited'to such combination as itis apparent that other combinations, may as readily be used, depending upon the circuit desired.

In order that connections may be extendcd from the receiver C to the contact springs B -or terminals 7, 8, the plug 9 has a portion 9 cut away andalso a hole 98 adapted to register with the opening 19 extending,r through the shell 1 and into receiver C. Any opening 20 is also provided at the lower end ot the device whereby conductors may extend from transmitter A to the terminalsV 7, 8, or contacts B depending upon the circuit arrangement. A. easing or handleD is also provided being preferably of 'an insulating aterial and as this casi ng covers the portion of the tube 1 wherein the springs B are located, and as it is desirable to have ready access to these contacts, l have constructed casing l.) of several parts 22, 23, cach part being independently secured by means ot' screws 24, 25 respectively, to the shell portion 1. I also preferably knurl thopcripheral surface of casing D so that tho longitudinal joints will. not be readily seen. Thus with this arrangement the portion 22.may be readily removed by taking out the screws 24, part 22 may be remove and the shell 1 being out away at 11, contact springs B aro exposed.

Tn Fig. 6 I have illustrated diagrammatically one method oi" connecting the device in circuit, the parts ot' Fig. G corresponding to parts of the device, being;r indicated by like reference characters.v Tn addition to thetransmitter A. receiver C and switch-hook contacts, a call bell 26condenser 27, and impedance coil- 28 are shown. lWith this cir- -Y .cuit ai'ra gement, when the microphone is suspender' the receiver, transmitter, and im-` pedance coil are cutout '0I circuit and the call bell 2o and condenser '27 are connected* in bridge ofthe line. Upon removal of th microphone from its supporting hoolc, thell contacts 14, 15, 16 are adapted to close means "tact set.

whereby the telephone circuit is closed for use.

lNhile I have embodied my invention in `a particular structure Worked into commercial form, it will be apparent that many changes and modifications thereof will readily sug gest themselves to those skilled in the art and therefore l do not desire to be limited to the exact structure as shown and described, but aim to" cover all that. which comes within the spirit and scope ofthe appended' claims. 4,

What I claim `as new and desire to secure by Letters Patentisr' 1. A. micro hone comprising. a handle' member, switc' l hookfcontaets carried there.

by, and a suspendingv switch-hook pivotally supported by said meinberlin operative relation tov said contacts whereby when the vvdevice is suspended ,by said switch-hook said-.f

contacts are operated.

Sti4

2. A microphone comprlsingi7 an elongated centralmember, a transmitter and receiver fastened to'opposite ends thereof, switch-v hook contacts carried by said member, and

a switch-hook pivotally supported at one end of said member in operative relation to said contacts.

3. A microphone comprising an elongated central member, a transmitter and receiver attached at opposite ends thereof, a switch- :hook extending from one end of said niem-` lloer and pivotally connected thereto, and

switching contacts suitably supported in operative relation to said switch-hoch'.

4. A microphone comprising an elongated central member, a transmitter and receiver attached' at opposite ends thereof, switch contacts carried by said member, a switch arm ivotally supported at one end of said mem r in operative relation to said contacts, and a suspending member secured to said pivoted arm whereby when thc device is suspended therefrom said switch arm is moved to operate said contacts.

5 A microphone comprising an elongated handle member, a'transmit-ter and receiver fastened to opposite ends' thereof, switch contacts, a. switch operating arm pivotally supported at the upper end of said member and a suspending device `extending from said arm in 'such relation to the rest of the device that when suspended therefrom said handle portion will assume substantially a perpendicular position. y 6. A microphone comprisingA a transmit? 4ter and receiver, a tubular, connecting Vmember havingt switch-hook contacts spaced within, av handle member comprising incasing portions ytor said tubular member, and for readily removing one o't said portions to provide ready access to said con- 7. A microphone comprising transmitter and receiver, a connecting; member havisc tions for said connecting' member and contacto, and means for readily ren'ioving one of Said portions to provide ready access to said contacts.

8. A microphone comprising a iransinitter and receiver, a connecting nieinher hai'- handle member voinprising incaeing por- Home independentlyY benin-ed over said oonremoved to provide ready access to said contacts.

l0. A microphone comprising an elongated central member, a transmitter and re- :ceiver attached at opposite ende` thereof,

switch hook contacts carried by said meniher, a `eliswendn@ switch-hook plvotally l supported in operative relation to Said Coning switeh--hook contacts eeenred thereto, a

mete, a handle member comprising incasing i portions l'or said member and contacts, and

neolingmember and contarle, and means for readily removing one el' said portions to .switch-hook: contarte: suitably" A riein f inde Vwnden'llv seein-ed ineaeine' orl h e t. i

tions ior said tubular member and eonael whereby one of iiaid portionsl may he rendi lneans for readilyv removing one ofeaid Iori'ions to provide ready access to said contacts.

Signed by me at Chicago, county of Cook and Stale of illinois, in the presence of two Witnesses.

LAWRENCE l lllUSON.

TWitneeses: A

G. E. Mi'nmgnn, XVM. Emol-mim. 

